Sewing machine



July 15,' 1930. J. KlEwlcz 1,770,855

SEWING MACHINE Original Filed July 17, 1924 6 Sheets--Sheei'l 2 J. KlEwlcz SEWING MACHINE July 15, 1930.;

6 Sheets-Sheet 3 Original Filed July l'?, 1924 w s Y,///

'A'TTY s.

J. KIEWICZ SEWING MACHINE July l5, 1930.

6 Sheets-Sheet 4 original Filed July 17, 1924 43 75 lnvenToT/z ,L Joh Kiel/ving A'TYS.

July 15; 1930. JQ Kl'EwlCz 1,770,855

. SEWING MACHINE Original .Filed Julyy 17, 1924 6 Sheets-Sheel 5 I @l1/WHW lnvenToT: John Ki e'wcg Ays.

July 15, 1930 .J. KlEwlcz -1,770,855

` SEWING MACHINE Original Filed July 17, ,1924 6 Sheets-Sheet f5 36 3742 4o avaigi 46 3' lnvenor.

, 'John Kewcg by/MMkM Ays;

across or transversely thereto.

Patented duty-15, i193() Unirse fern-'Tes ineen Persererstes MACHINE consensi.. on Bosroit, iinssncnussr'rs; n Conroe-Arroyos MAiNii snwriiGiMAoHmn Y Application ined July 17', 1924, sena; No. 726,535. neiiivfi sp1-i1 ze, 1927. j

'i his invention relates te machines o'l` that class which are used or making a line ot reinforcing stitching for reinforcing fabric at some point,l such for instanceas. at the end ot a louttonholeor 'at-the end fof a pocket slit in garments or Aanyot-hersimilar places Where a so-callec tack .orreinforcing stitching is desired. Sewing machines adapted for this purpose are sometimes referredto as tackers. i i

The present inventionrelates to that class oftacl\ers which make a vline of reinforc-- ing stitching that comprises aseries'of `relatively long stitches extending from one end. 'tothe other of the bar or 'tack to loe formed :ind another series "of shorter stitches which l; extend transverselyoithelong stitchesl and overlie the latter. The first mentioned 4 stitches are sometimes referred toas the underlying stitches or as Vthe .longVY stitches-ami the second group of stitches are Y.

sometimes re'terredfto` as the ffoverlying? stitches or as the cross stitches since they overlie the long stitches and :also extend The objectV of my invention is togprovide a sewing machine of thistype Which has various novel features all as 'will be more Jfully hereinafter se'tfiorth and .then pointed out in the appended claims. Y

In the drawings' 1 Fig". 1 is aside view of asewingfmachine embodying my invention With thecoverplate removed 'to sho-.v the actuating mechanism;

Fig-2 is ajsection on substantially the line i2-2, 1;

Fig. 3 is a vertical section on substantially trie inleg-3,A 2;

7lig. e is a horizontal section on substantially the line .4 4, Fig. 1;

5 is 'a horizontal section showinga portion ot the stop mechanism;

Fig. is a section on substantially the line f3-(3. Fig. 1;

Figlie-a Fie'. 8 is a sectionalvieiv showing the mandriving shaft V .a horizontal section on snbstan- `tially the Vline T-'T, Fie. 1;

f 10 is a. "section on the line 10--10, Fig. .1'

' `Fig. '12 s a. section 'shovvingthe clutch for Fig. 11 is aide'tai-liofthe stop mechanism clutching theshort stitchcamto the driveV shaft; n if n Fig.; lillustrates the ormof 'stitch Which is made hy Vthe'sevving machine; f

i Figs. le and 15 are fragmentary detail views of the stop motion;

F ig. 1 6 is a ldetail vievv showing tion. oi the feed cam? Y i r Figs. `17 f and'lS are sectional views illustratingthe manner in which the long stitch cam is unclutched from thedriving shaft.;

rFie. 19 isa fragmentary view showing the clutc scontrolling means for the short-stitch camg'ff v Figs.V 2O and 21 are views illustrating the vclutch Vorthe long-stitch cam.

:The type oitfstitching which is made ,by the sewing machine is illustrated in Fig. 13

and it comprisesa plurality of long or under'- lying stitches 1 and a plurality of short or Which reciprocates theneedle bar 7 carrying the needle 8. Y

The needle operates in a and the stitching is Jformed byrgiving the work clamps 5 a vibrating movement. rlhe Work clamps are given a long vibrating movement in one direction toform thelong stitches 1 'and then are ,given afshorter vi'brating movement in another Adirection to "formthe short stitches 2 and` While the short stitches kare being termed the i'eed'clamps are also given a i'eedingmovementin the directionot l the long stitches so that the short stitches will extend from Aone end to the Vother ot th long stitches.v N Y The arm 4: also forms at its end asupport the omperaf voi" fixed 'vertical path y for the under thread mechanism which is in the form of a shuttle or hook of any usual construction which maybe indicated generally at 9.

The machine is driven from a driving pulley l which is adapted to be clutched to a driving shaft 1l by 'means of a. suitable clutch controlled by a clutch Vcone l2 that is slidably mounted on the driving shaft.A rhe movement of the cone i2 to the left Fig. 3 throws the clutch into operation and when the cone is in the position shown in Fig. 3 the clutch is disengaged. This clutch cone is actuated by a clutch rod 13 slidably mounted in the frame and provided With a. spring lil which normally holds it in its inopera-` tive position. lt is thrown into its operative position to 4clutch the pulley to the shaft by means of a lever l5 pivoted at 16 to the Yframe and ad-auted at one end to enOaOe .the

l Y o :n

rod Y13 and at the other end connected to a .suitable .treadle by a link 17. l A

rlhe shaft ll is geared to a needle-actuating. shaft 18 by suitable gearing if), 'said shaft 18 extending longitudinally the head 6 and being operatively connected to thc needle har in any approved Way.

The hook or shuttle is actuated from a rock shaft 20 Which hasa'crank arm 2l thereon that is connected by a link 92 to Aa. crank 23 on the shaft 18.

The work clamp 5 comprises tivo clamping members 24, which can vbe opened to receive the Work between them, the member 25 having the resilient shank 26 Which yieldingly holds the upper clamp clamped against the Work. The clamp may be. opened by means of a lever 27 pivoted at 28 and connected to the upper clamp by a link 29. The Work clamp is pivoted tothe arm il at 30 and `the oscillating movement .of the Work clamp about the pivot is that which produces the long stitches. The Work clamp Acan also vibrate longitudinally of the arm and this is the vibration which is given to it during the formation of the short stitches.

The oscillating movement of the Work clamp during which the lengstitches are formed is derived from Va long-stitch cani and the other movement of the Work clamp during which the short stitches are formed is produced by a short-stitch cann liese cams are mounted on a vertical cam shaft 31 which is supported in suitable bearin in f the frame and Which is driven from the shaft 18 through a suitable worm gear 32.

The long-stitch cam by which the long stitches l are formed isiindicated at 33. lt is provided with a cam groove 3l in which operates a roll carried on the end of an arm that is fast on a vertically-extending rock shaft 37, said rock-shaft having an arm 33 extending therefrom which is connected to the rear end of the Work clamps. The cam groove 34 gives anoscilla-ting movement .to the arms 36 and 38 and such oscillating movement is transmitted to the work clamp thereby oscillating it about its pivot 3U. The connection between the arm 3S and the work clamp is an adjustable one to provide for making underlying stitches of different lengths.

As herein shownl the arm 38 is formed with a slot 39 in which is adjustably mounted a connecting vblock l0, the latter having a stud Ll-l which operates in a groove ft2 formed in the rear end i3 of the Worn clamp. rlh'is connection provides for transmitting the oscillating movei ent the arm 3S tothe Work clamp and by adjustment of the block 40 provision is made for varying the amplitudev of oscillating movement of the vror` clamp and thus the length of the lon stitches l.

1When the machine is started in operation the long-stitch cani 33 will make one revolution andLA then will be automatically brought to rest at which time the short-stitch cam. present-ly to be described. will be set in operation to produccshort stitches 2. rl`he long-stitch cam is loose on the cam shaft 3l but it is adapted to be clutched theretoby a clutch pin 44. Which is slidable vertically through'the cam member 33 and is adapted to engage in a'notch or recess 45 formed in aycollar i6 that is Yfast on the cam shaft 3l.

' This clutch pin 44 is acted upon by a spring Il? which holdsit yieldingly in its operative position.

The means for disconnecting the clutch pin la from the collar t6 when the long-stitch `cam '33 has made one complete revolution comprises atlisengaging lever 48 pivotally moulntedona vertical shaft i9 and provided with a. cam nose 50 adapted to co-operate with a cam surface 5l formed on the head of the pin'il 1 Vhen the cam surface 5l rides up on the cani surface of the nose 50 the clutch pin lll Will be raised against the action of the spring and thereby Withdrawn from the soclzct l 5, which action will unclutch the long-stitch cam from ,the driving shaft 31.

At the time that the long-stitch cam is thus unclutched the short-stitch cam is automatically clutched to the cam shaft 3l;

The short-stitch cam is indicated at 52 and it acts on a roll 53 carried by one arm of an elbovvv lever 5&1 which is mounted to turn on the rod 49, the other arm of said lever being connected by a ,link 55 to the rear end 43 of the Work clamp. This roll 53 is normally heldV against the cam by means of a spring 56 and the co-operation of said spring and the cam 52 Will give the lever 54 an oscillating movement which Will produce a reciprocating movement in the Work clamp inthe direction of the length of the arm 4;. The cam 52 is clutched to the shaft 3l through the medium of a clutch device illustrated best in Fig. 12 andwhich comprisesY a clutch pin 56 carried by the cam member and adapted to enter in one of a plurality of recesses or notches 57 in a clutch collar 458 which is splined` to the shaftfl .and is movable vertically thereon. This clutch' collar 58 is vcontrolled from thellong-st1tchcam 33 in such a way that when the long-stitch cam is automatically disengaged the clutch` collar 58 is shifted toclutch the shorty-stitchl cam 52 to thev shaft 31. Y

The long-stitch cam 33 is a notch 60. Pivoted .to the frame at'61 is an arm 62, the nose 68 ofwhich travels on 'he cam rib 59. This arm has connected thereto a linl `73 which carries a pin6li provided with a roll 65 that operates in a groove 66 formed in the clutchcollar 58. The lower end of the link 7 3 is provided with aslot `67 in which is received a4 `guide pin or screw 68 arried by the bearing` 69.

70 indicates a springacting vvon the lower end of the link and tending to move it upwardly, said springr operating' tofhold the nose 63 against the camrib 59.. When the nose is on the high part of the cam rib, as shown in Fig. 19,-the clutch collar 58 will Vbe in its lowered positionV and the shortstitch cam 52 will be disconnected from the shaft 31. This is the positionk of the parts while the long-stitch cam 83, is rotating and forming; the long' stitches 1. hen the longstitch cam has completed its rotation and the Y long' stitches 1 are all formed the notch v60 is at that time inline with thenose 63 ofV the lever 62 and said nose- .will` enter the Anotch under Vthe influence of the spring 70 thereby raising the link 7 3 andraising the clutchcollar 58 into the position shown in Fig. 12, thereby clutching the-short-stitch cam 52 to the shaft 31. As soon as thisfoc` curs the work` clamps are given a reciproeating` movement ofrelatively short ampli-- tnde in `the direction of the length of they arm l thereby to formthe short stitches 2.

` Buring the formation of the short stitches 2 the work clamps V5 have a feeding move ment in the direction of the long stitches so as to carry the short stitches from one end tothe other of the bar. This feedingmove- `ment is controlled by a feed camfrl Vthat is loosely mounted on the shaft 31 andis actuated at the proper time. y

The feed cam co-operates with one arm of an elbow lever 72 which is loosely mounted on the shaft 49 and the other arinfl of which engages a pin 7 5 rising from the end 43 of the work clamp. `Then vthe long,` stitches 1 have been completed the work holder is at one end of its strokeand inthe fnll Aline position shown in Fig. 16. At this time the feed cam 71-`is moved into a position -in which it will engage the elbow lever. 7 2, said lever resting against the high point of the formed with' a f depending' cam-rib591which is provided with cana. Theicam is then Vfed forwardly with i a slow movement into the dotted line posij tion Fig.- 16 and during this forward movementthe elbowy lever 72 will ride down the face of the camand the work clamps will be,

moved. from the full to the dotted line posi` `tion Fig; 16. This feeding movement of the work. clamps occurs while the'shortstitc'h cam is operating'and'by this means the short stitohesl2 are carried from end to the other ,of the bar and the workclamps are returned to the initial position vwhich they occupied Y at 'the .beginning ofL thesewing, operation.

operated will now be described. This vcam and is acted on by a spring 84 which n'orn'iall'ytends to turn the cam from the' dotted line ,position to the full line position Fig'. 16. "The camz71`has rigid `therewith a ratchetmenr ber 7 6 which is fed'fornard at pr'operftimes by means 'of feed pawls 77 .carried on a pawl" carrier 78, that is mounte'dtooscillate about the shaft 31. .This feeding movement of the ratchet which is derived from thefeedpawls 77 turns `the ratchetand cam anti-clockwise in Fig. 16 or in opposition tothes'pring' 84. z t will be rememberedthat .when the long; stitches 1 havev been completed the icam 71 is in thev full line positionshownin Fig.. 16

and asthe short-stitch camis set 'in operation toV form the short stitches the feed cam 7l is .f The means by which-the feed cai-n.71 is,`

reo is loosely mounted on the criving shaft. 31

given a slow feeding movement by the pawls 77 from the `full line position around into the dotted line position 16. .During` this feedingmoveme'nt of the cam@ 71 the work clamps areY acted on by a spring,y which will ,be presently described tending to swingthem Y from thefull line position to the dotted line position Fig.'16,this spring holding thepin 7 5 against the arm 74'of the lever 72 and also holdin-,g` s'aidlever 72 against the cam. 7l.

Therefore; as the cam 71 isfed forward lby vthe pawl 77 and ratchet 76 the lever 72 will follow down the cam and the work clamp will 'swing slowly about its central pivot 30 under the influence of the labove-mentimed spring` one end to theother of the'long` stitches.

rThe pawl carrier 78 is .connected by: a link 79 to the long arm 80 of the eibow lever l511. The pawl carrier 78, therefore, oscillate's with the lever 54 and at-each forward movement of said lever and pawl carrier the ratchet 7 6 and cam `71 will befed forward onev stepprovided the pawls are in mesh with the lever.

. thereby slowlyfeedingV the work. clamps from *y This forward feeding; movement of the camV i 71 is in opposition tothe laction of thespring `84 above referredto. VThis spring is lin the nature of a spiral spring, one end of which is v'connected to the cam .71 and the othercnd of whichis connected to the frame at 85. VThis spring-8l is thus wound np or.y placed under tension .as the cam 71 is fed from the full line position Fig. 16 around to the position shown in Fig. 6. The ratchet and cam are normally held against return movement under the action of the spring by me-ans of a stop member or brake 81' which engages the ratchet teeth and is carried by an arm k82 extending from a yoke 88 `which is loosely mounted on the shaft 37.

It `will thus be seen. that at the end of the formation of the long stitches land at the beginning of the short stitches 2 the cam 71 is in the full line position Fig. 16 and the Work clamps are also in the full line position, the last penetrating .thrust of the needle being at the upper end of the :tack or bar. As the .line position F 16 and during this short stitches arel formed the cam 71 is fed forwardly by the pawls 7'! into the dotted ment of the cam'tlie lever 72 rides down the cam face and the clampsY move graduali from the full to the dotted line position thus moving the Work so that the/short stitches will be carried from one end to the other of the tack. As soon as the short stitches 2 have been completed the machine is brought to rest by means Which Will presently be dcscribed. The means for oscillating the'pawl .carrier 78 is constructed Aso that the amplitude of oscillation may be varied, this resulting in varying the rate of movement of the feed cam and consequently both the spacing of the overlying stitches and the number of said stitches for any given length ofunderlying stitch. As shown in F ig. 6 the arm 80 is providedivithv a slot 18d-and the end of the link 79 is adjustably secured in said slot.

Since the arm 80 has aV fixed amplitude. of.

movement the adjustment of the link 79 in the slot 180 will result in varying the amplitude of' oscillation of the pawl carrier 7 8 and vthereby the rate at which the feed cam 71 is operated. If the speed of operation" of the feed cam is increased the spacingrof the overlying stitches Will be greater and there will be fewer of said stitches for a given length of underlying stitch but if the speed of the feed cam is reduced then the spacing of the overlying stitches will be less and the number of overlying stitches will be greater.

This adjnstnient7 therefore, constitutes means whereby the number and spacing of the overlying stitches may 'be adjusted and such adjustment is entirely independent of the adjustment of the block si() by Which the length of the underlying stitch is adjusted.

During the feeding of the feed cam 71 from the full to the dotted line position F 16 the spring 8l is Wound up. Means are provided Whereby as soon as the long stitches are begun on the next succeeding tack the pavv'ls 77 will be released from the ratchet 76 'and vill be held released While the long stitches are being formeel. The cam 71,'hoivever.y is prevented from being returned to the full line position under the influence of the spring 84 by a stop member or brake 81, and means are provided for releasing this brake just before the long stitches 1 are completed so that the cam 71 Will be positioned in its the lower end of which engages a projection 89 formed on a paul-releasing plate 90. This paWl-releasing plate is situated beneath the pawl actuator' 78 and is provided with plus 91 which extend through slots 92 formed in the actuator and Which are adapted to engage the paivls 77.

LThe paivlueleasing plate can move back and forth on the actuator and is guided in its movement by guide pins 93 carried by the pawl actuator and operating in slots 911 formed in the pawvlreleasing plate 99. This j )aivl-releasing plate and the paivl actuator are connected by a spring 95 which normally tends to hold them in the position shown in F ig. l0 with the pins 91 disengaged from the parvis. If the paul-releasing plate is moved to the left Figs. 6 and 10 the pins 91 will engage the pawls and carry them out of engagement With the ratchet 76. |This disengaging movement occurs when the nose 63 rides up on the high part of the cam rib 59 as the long-stitch cam is started in operation so that While the long stitches 1`are being formed the paWls 77 are out of engagement with thev ratchet 76.

rlhe feed cam 71 is, however, prevented from being returned to the full line position by the spring 84 during the formation of the long stitches by the operation of the stop member or brake 81 as above stated. This brake 81 is released from its engagement with the ratchet 76 by a cam projection 120 formed on the Vlong stitch cam 33. It will be reinembered that the brake 81 is carried by an arm `82 of a yoke 83 which is loosely7 mounted on the shaft 37. This yoke is formed with an other arm 121 Which carries a pin 122 that normally engages the peripheral portion of the cam'33. The cam 33 makes one rotation for the formation of the series of long stitches and ust before it compl Jes its rotation. that is, just before the long.; ses are completed, the cam projection engages the pin 122 and swings the arms 121 and 82 of the voke outwardly thus releasing the brake 81 from the ratchet. rlhis is the position of the parts shown in Fig. 16. As soon asvthis occurs the ratchet is released and the spring Sli returns the ratchet and feed cam from the dotted line to the full line position Fig. 16.

WV hen the cam 33 completes its rotation Vio Y j the pand-releasingplate and allowingfit'to move into its inoperative position under the thus terminating theiformation ofthe long 'stitches 1 the nose 63 drops into the notch 60 'and at theV same time the cam 120 passes ont of engagement withrthe pin `122. As a "resiilt of the latter operation the 'brake 81 is allowed to resume its operative position under the influer-ce of' a-spiingVv 123 and the dropping of the nose 63 into the notch 60 'allows the arm 62 to move upwardly and the arm 8S to move to the 'right thus releasing engagement with the ratchet the continued operation ot' the machine will actuatef the short-stitch Acam thcusu forming the short p stitches as above described.

n It will be remembered'that the long-stitch y cam 33 is provided with aclosed cam groove 34 in which the roll 35 operates.' In'orderto permit the slow feeding of the work from one end to the other of the long stitches while 'face lsconntrlc throughout the greater POT-i for.V automatically bringing it to rest attei- 1 the short stitches '2 have beeneompleted. I

vthe short stitches are being formed the groove 34 of the long stitch cam 33 is'provided with a wide portion 96 sositiiated thatvwhen said cam lcomes to rest at the end` of the long stitchesthe roll 35 will beinthe wide por-V Y tion. This wide portion allows the swinging movement of the arm 36 necessary tor the feeding movement while the sh0rtstitches are being formed.

The feeding movement while the short stitchesl arebeing formed is accomplished by aspring 97, one endof which is connected to the arm 36 and the other end of which is connected to'- a lever or arm 99 that is loosely mounted'on the shaft 37. The end of the arm orlever 99 carries a roll` which operates againsta vcam tace 100 that is rigid with the cam member. 33. This cam tion of its extentbnt is provided with a rise 101, the latter being situated to engage the arm 99 just-as the cam 3 3 is bronghtto rest.

vAs the rise 101 passes underthearmlllthe latter isswting inwardly somewhat and the spring 95? is placed under tension, said spring tending to swing-the arm 36iiiwardly and throngh the connections 40541 and 42 tending to swing theworkclamps from the full `to the dot-tedlinefpositionFig. 16. This is the nspringwhichl'ioltls the lever` 72 against l the feed cam 71"and, therefore, as the feedcam il is Vfed vfrom the full 'to the dotted line position Fig, 16' thelsprin'g 97 willcause a, Y.

of the work clamps ,pleted Vand the long-stitch cam 33 has come corresponding feedingmoveinent of the work clamps.

In order to prodiice ajp'roper tack or bar it Y is desirable that the long stitches l'shoi'ild be laid centrally of the-short stitches "Zand Y 'totliuse center the: workV clamps `so Jrar as their jogging movement longitndmally of thearm4 is concerned while the longstitches lowing mechanism. Y

The arm 8O -ottheelbow lever 54 is Vprovided with a hooked vextension v102 that is adapted'to 'engage the lower end of alever f103hpivoted to thefframefat 104.v "hisllever 103 has a projection `105 thereon which cooperates with a projection 1067ontlie link 7 3 to center thework clamp during the formation of the long stitches.` It willbe reinem#V beredrthat the'arm 80 of. theelcbow lever 54 is actedl upon by Va spring l56 which 'tends are being .formed Il'iave providedthe tolnormally to hold the workclamps at one eX- i,

treme limit oftheii movement in a vdirection longitudinally of the arm 4. Vihen the longstitch cam 33 is at rest and the nose 63 is in 1 the notch 60, as shown in Fig-1, the link 73 willV be in itselevatedvposition and atthis time the projection 105r'thereon'isabove and outof alignment with theiprojection 105 as shown in Fig. Vhen', however, the long 'stitches are being formed and the cam 33 tions limit the lateral swi'n'gingmovement of the work clamps due to theoper'ation of the spring 56 and hold them in their central 'position.,

As soon as the long stitches have been comto rest with the -notchjjGO 'opposite the nose 63 the spring 70 'will raise the link 73 thiis Y I i 11o withdrawing the vproj ection 106 'from behind the projection 105. j Thereforg Ywhen the short-stitch cam isset inv operation the elbow lever 54 is permitted to have its fiill swinging movement.- f Y Y The machine is also provided with means have above referredt'o the chiteh byA which.

' 109 when'the rod is movedinwardly to throw i" l' 1 the clutch into engagement. Y 'Y n 1x25 l l This latch member 109 is pivotally mounted onthearm 121 ofl the yoke 83t prefer ably being c pin122. Said latch is alsojacted en by Spring 124 which Ltends normally to more it g pivoted on an extension. oit the that when the feedirf" of the forming of the loner stinwardly into engagement with .the shoulder 108. This latch is provided with a rod 125 Yon which is slidably .mounted a @releasing dog 126, the latter having a spring 127 connected thereto which normallyholds it sepa- `connected from the shoulderl-OS .thiisfallowring' the clutch spring to disconnect .the driving clutch.

This clutch-releasing means comprises a .cam member 128 provided with a cam projec-V .tion 129. l .secured to a collar 130 that is rigid withvthe .feed cam 71 andthe ratchet 76 by means or" screw 131 which .entends through a slot in Said earn member adjustably .the cam member 128. "This cam member .iith its clutch-releasing'nose 129 is .so positioned cam 71 is in the .'l'ull Vline position Fig. 16 the nose will .be insubstantially the position shown in Fig. 14. ,as the feed cam 71 is Ifed forwardly :tor torinaition of the short stitches the cam-releasing vmember 12)V will kbe Amoved from the posi- .tion shown in Fig. 14 to that shown in Fig.

15. As it moves int-o the: position shown .in Fig. 15 the camk projection 129 engages vthe dog 126 and slides it 'forwardly on.` ythe rod 125 until it engages the end ot' the latch 109 as shown in Fig. 15. s the releasing .cam 129 continues its movement the latch` 1,09 will be swung outwardly intothe dotted line postion Fig. 15 thereby becoming disengaged from the shoulder108 andalflowing .the clutch spring 14 to disengazge the driving clutch. As soonas this occurs the spring i127 will return the dog 126 to the tall line position Fig. 14, thus carrying it bach of the clutchreleasing cam 129. The latch 109 is thus free to he swung into its operativo position again as soon as the 'clutch-controlling rod V13 is moved tov render the driving clutch operative.

rllhis clutchl with an incl'. o mee-..103 andthe dog 126 is also provided wit'han inclined face 134. JFurthermore the dog` can not only slide .on

the rod 125 but can turn Ythereab@it that when the feed cam 71 is released atthe end n d -tches and is carried into the full line sition Fig. 16 by the wound spring 8.4 the clutch-releasing cam 129 will simply ride :under the-dog 126, the latter swinging upwardly to .allow the cam to pass.

The clutch-disengaging lever 48 by `which the llong-stitch-cain funclul'ched from the' driving shaft isnormally held out `ot engagement when Athe .drivingr clutch is disengaged. This is accoinpiished hv a pin 1316 ou the 3V hen the clutchl rod 13V lis moved inwardly to render the mani driving' clutch operative the pin 186 is moved away from the extension Y 137 of the arm 48 .thus allowing-the latter to .soon,.however, as the long-stitch cambegins to turn in the direction of the arrow for the formation oi the long stitches the friction .ot the strut member 140 against the iin ce 141 will swi g said strut member into the dotted line position shown in *`ig..18 thus allowing the cam nose to be brought into position so that when the cam 33 completes its rotation kthe head of vthe clutch pin 44 will ride up the 50 as seen in Figs. 2O and 21 thus in' he long-stitch cam 33 from the cam shaft oi asabove described.

The herein described sewing machine .is

constructed :to form a group of underlying stitches vand thento form a group of overlying` stitches and is provided with Ymeans for varying the number ot theov'erlying stitches witho ut changing the length of the underlving stitches. Furthermore, hy means of the construction herein shown it is possible cure .uniform spacing' of .the overlying stitches regardless oit the length of the underlyingjr stitches.

-I-t is also to be noted that the machine hereinrsliown has a longrstitch cam for reciprocating the work clamp.' to form the underlying stitches. and second cam referred to as a short stitch7 cam for giving the worhv clamp a reciprocating movement in' another direction to 'form the overly-*ing stitches and a tl'iirdcam. the feed cam,"t`or giving a feedingmovement to the Ywork clamp during the formation of the-overlying stitches.

1 claim:

1. 1n a sewingl machine, thev combi-nation with 'stitch-forming mechanism, of worklioldin means, acam shaft, acam loose thereon for reciprocating'the work-holding .means in one direction, afsecond cam. loose' thereon i eciprocating tir-ie work-lioldingm'eans in an... direction, .operative-connections between each cam .andthe iWork-holding means, means .to connect the first-named cam t0 the t .7o .cliftch-controllingrod 13, which engages the end 13T ot the lever 48,*as shown in Fig. 4.

cam shaft and th en to disconnect it therefrom' after it has performed a predetermined, sewingr operation, and meanscontrolled by the first-named cam to connect the second cam to the cam shaft when-the first-named cam is disconnected therefrom. A y `V 2. In .a sewing machine, the con'ibination with stitch-forming mechanism, of workholding means, a cam shaft, a cam loose thereon foi-reciprocating the work-holding means thereby to form relatively long underlying stitches, a. second cam loose on the camshaft for reciprocating the work-holding 4means in another direction to form relativelyV short overlying stitches, means to connect the firstnamed cam to the` cam shaft and then to disconnectit therefrom at the end of a predetermined sewing operation, and means controlled by said first-named ca m to connectthe second cam to thc cam shaft'when the firstnamed cam is disconnected therefrom.

3. In a sewingfmachine, the combination with stitch-forming mechanism, of averliholding means, a cam shaft, a cam loose thereon for reciprocating the work-holding means 'in one direction, al second cam loose thereon for reciprocating the work-holding means in another direction, operative connections Vbetween each cam and the work-holdingl means,

means to connect the fnst-namedcam to the cam shaft and then to disconnect ittherefrom after it has performed a predetermined sewing` operation. means cont-rolled by the firstnamed cam to connect the secondzcam to the camshaft when the' first-named cam' is disconnected therefrom, and means controlled hy the second-named cani to bring theV machine to rest. i Y

4t. In a sewing machine, the combination with stitch-forming mechanism, of workholding means, a cam shaft, a long-stitch cam loosely. mounted on the camY shaft, meansY operated thereby to vibrate 'the work holder thereby to form long underlying stitches, a short-stitch cam also loose on said camshaft, means operated thereby to vibrate'the work holder in another direction to form short overlying stitches, means to connect'thelongstitch cam to the cam shaft and to disconnect it therefrom after a predetermined sewing operation, and means controlled by the longstitch cam atthe time itisdisconnected from the camshaft to connectthe short-stitch cam to the camshaft. y y V- 5. In a sewing machine, the

holding means, a cam sh`aftja`longstitch cam loosely mounted on the cam shaft, means'operated thereby to vibrate the work holderl Athereby to form long underlying stitches,A a Ashort,-stitch cam also loose on said cam shaft,v

means operated thereby to vibrate the work Y holder in another direction to form y short Voverlying stitches, means to connect the longstitcli cam to the cani shaft and to Vd lsc'onnect combination `with stitch-forming mechanism, of workit .therefrom afterfa' predetermined sewing foperatiom-means controlled by the long-l stitch lcam; at the time it fis disconnected from the cam shaft to connectl the shortstitch ycam to thecam shaft, andmea-ns con-l trolled .by the short-stitchv cam to fbr'ing the Vmachine to rest. ;V f Y 'Q 6.V Ina sewing machine, the combin'ation withA stitchsforming mechanism, of 'workholding means,i'a'cam shaft, a long-stitch cam loosely mounted thereon' and operating tovibrate the work-holdingfmeans to produce long underlying stitches, a short-stitch cam also loose on the shaft and operating'to. vibratethe `work-holding'fg' means in another direction toform short overlying stitches, a

feeding cam loose on the cam shaft forl feeding the work during' the formation-'of the short stitches, meansto connect Lthe longstitch cam to the cam shaft and to disconnect ittherefrom at the end of apredetermined sewing operation, means controlled by the long-:stitch cam for connecting tl1eshortstitch cam tosaid cam shaft whenV the longstitch cam i is. disconnected therefrom, and

means actuated by the short-stitch camto operate the feed cam'f with stitch-forming "mechanism, of 'workholding 'means, a camshaft, a long-stitch cam loosely `mounted thereon and operating to vibrate] the work-holding means to pro-f duce long underlying stitches, av short-stitch vibrate the workholding means in 'another direction to form short over-lying'stitches, a `feeding cam loose on the V.cam shaft for .feeding the work during the `formation of 7 In a V'sewing machine, the combination also loose onl the 'shaft'and operating to Y the shortstitcheameans to connect the long- .i

stitch cam to the cam shaft and to disconnect it therefrom at the end of apredetermined' sewing loperation,'means controlled by the long-stiteh'cam foi;` connecting the short-stitch camgtol said cam shaft when the long-stitch cam vis,` disconnected therefrom, .means actuated by the short-stitch cam toopcrate the feed cam,- and means controlled by the feed cam to .bring'the machine to rest:

, 8. Ina sewing machine, the combination with stitch-formingV mechanisnrnr of work! holding means, a cam shaft, a long-stitch`V cam loosely Vmounted thereon andfoperating Yto vibrate the work-holding means to pro-V duce long underlying stitches, a short-'stitch cam also loose on the-shaft and operating toi vibrate the work-holding means in; another direction toform short overlying stitches,`a feeding camloose on the camshaft for feed- -V ing the work duringthefformation of the Y short stitches, means to connectA the long-Vv stitch cam to the cam shaft'and to disconnect ittherefrom at the endofa predexermiIir-,dk sewing operation, meanscontrolledjbyth'ef.V

long-stitch earn for connecting the shortstitch ,Garn to said cam shaft'when the longY an' f 8 ,e arroces Stitch cam is disconnected therefrom, means actuated by the short-stitch cani to give t-he feeding cani aforward feeding movement, a spring to return said feeding cam to its initial position, and means controlled by the long-stitclicam for disconnecting the feeding cam from its actuating means. i

' 9. In a sewing machine, thecombination vwith stitch-forming mechanism, of Wori -i ,1, holding means, a cani shaft, Va long-stitch cam loosely,7 mounted thereon and operating to vibrate ,the Work-holding means to produce long underlying stitches, a short-stitch cam also loose on the shaft and operating to vili, hrate the Work-holding means in another direction to form short overlying stitches, a

feeding cam loose on the cam shaft for feeding the Work during the formation of the short stitches, means to connect the long- 20 sti-tch cam to the cam shaft and to disconnect it therefrom at the end cfa predetermined sewing operation, means controlled by the long-stitch cani for connecting the shortstitch cam to said cam shaft When the long- 25 stitch cam is disconnected therefrom, means actuated by the short-stitch cam to give the feeding cam a forward feeding movement, a spring toretnrn said feeding cam toits initial position, meanscontrolled by the long- ;,0 ,stitch cam for disconnecting the feeding cani from its actuating means, and means con` trolledhy the feeding cam to bring the machineto rest. Y

In testimony whemof,l I have signed my 35, name to this speciiieatiom .JOHN nriiwioz, 

